Google saves links to the videos watched at Google Video to Google Search History. So the next time you want to find the video about Apple you watched last week you can search your Google History. If you are there, you can bookmark the video with Google Bookmarks.
Another new feature is Movers & Shakers. If you don't know the meaninig of the idiom, it's "one who wields power and influence in a sphere of activity". Google groups videos that are most influential in a restricted territory. You can see the moves & shakers in a country (for example, US).